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    Home > Active Ingredient News > Drugs Articles > What should be paid attention to when installing the ventilation system of the fume hood

    What should be paid attention to when installing the ventilation system of the fume hood

    • Last Update: 2020-01-09
    • Source: Internet
    • Author: User
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    1、 Selection of laboratory fume hood and fan: axial flow fan and centrifugal fan are generally used for installation of laboratory fume hood DC fan is generally used for short exhaust duct in laboratory, and centrifugal fan is recommended for duct more than 10 m The resistance of the duct with long air is naturally large, and centrifugal fan has large power and air volume, so centrifugal fan must be used Generally, the fan is made of PP and FRP II Installation of laboratory fume hood fan: 1 The foundation of laboratory fume hood fan is required to be level, firm and the foundation height is ≥ 200mm 2 The steel support of the laboratory fume hood fan must be fixed on the concrete foundation, and the rubber damping pad must be added between the steel support and the foundation of the laboratory fume hood fan All fan and motor components are installed on the whole steel support, and the steel frame is installed on the damping pad at the top of the foundation, and the damping pad is made of multi hole rubber plate 3 The diameter of the outlet of the fan can only be increased and cannot be reduced The outlet shall be equipped with insect proof net, and the rain cap shall be added when it is inclined to the upper outlet 4 The laboratory fume hood - the fan and the air duct are connected by flexible hose (flexible material and non combustible), the length should not be less than 200mm, and the pipe diameter is the same as the inlet and outlet dimensions of the fan In order to ensure that the hose does not twist or deform during the operation of the system, it should be installed with proper tightness For the canvas hose installed at the suction end of the fan, it can be slightly tightened to prevent the fan from being inhaled during operation and reduce the cross-sectional size of the canvas hose III precautions for installation of laboratory fume hood air duct support: 1 All bolt holes on the air duct support shall be drilled, and gas welding is not allowed to cut holes; 2 The bracket with inclined support shall be fully welded; 3 No other professional pipes or cables shall be installed on the air duct support IV precautions for concrete foundation construction: 1 Before pouring concrete, civil engineering shall check the position of foundation, elevation of foundation top surface, geometric dimension of foundation, position and depth of reserved bolt holes with professional design drawings, and the elevation of foundation top surface shall not have positive error (that is, it is not suitable to call out the design elevation) 2 The depth of the foundation buried below the ground shall be constructed according to the design requirements, generally no less than 50mm, the concrete shall be dense, the external surface shall be smooth, and the concrete strength grade shall meet the design requirements 3 After the fan is fixed, the anchor bolt holes shall be grouted twice Pea stone concrete should be used for secondary grouting, and cement mortar should not be used to pour holes 4 The suspender in the hanger shall be accurately cut and no lap weld shall be found in the middle of the suspender; 5 When the cross section of the air duct is small, the suspender of the air duct can be fixed on the floor with expansion bolts, and when the air duct is large, it shall be fixed by drilling 5 Before the installation of the bracket, the center line of the air duct shall be snapped on the wall, column and floor, and then the horizontal position and elevation of the bracket shall be determined to ensure the levelness and plane center position of the installed air duct; 6 Before the installation of the bracket, the exposed part shall be derusted and painted with antirust paint 7 If there is no special requirement, the spacing between the air duct supports of the fume hood is generally 3M, but for the air duct less than 3m, a support shall be installed at both ends, and the support shall be added at the tee and elbow.
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